If no one claims the lost umbrella, the person who found it can keep it.

如果没人认领这把丢失的雨伞，拾到者自己可以留着。

youdao

Somewhere along the way I lost my umbrella.

我把雨伞丢失在沿途某处了。

youdao

They lost their umbrella in the wind and nearly fell over.

她们在大风中弄丢了伞，她们俩几乎跌倒。

youdao

INC, once an umbrella group for several parties, lost most of its network when Mr Hussein's troops overran its base in northern Iraq in 1996.

ECONOMIST: Iraq��s opposition: No aid yet for Saddam’s foes | The

Most industry watchers agreed that big umbrella sites like MySpace and Facebook have lost some sizzle to smaller niche players, which can offer advertisers more precisely targeted audiences because the sites cater to specific interests.

FORBES: Facebook Falters In Europe